4. 格利佛摔倒在沙灘上,然后睡了過(guò)去。

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      What is the first thing you want to do when you see someone yawn (打哈欠) ?You want to yawn,too!Yawn is contagious.

      Scientists have found that all people yawn. Babies start to yawn even before they are born. The earliest yawn takes place when a baby is still inside its mother. When young children are about one year old,they start to yawn when they see others yawning. That’s why scientists (科學(xué)家) seem to think yawning is contagious.

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